[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-mockup.c

/*
 * GPIO Testing Device Driver
 *
 * Copyright (C) 2014  Kamlakant Patel <kamlakant.patel@broadcom.com>
 * Copyright (C) 2015-2016  Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irq_work.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>

#include "gpiolib.h"

#define GPIO_MOCKUP_NAME	"gpio-mockup"
#define	GPIO_MOCKUP_MAX_GC	10

enum {
	DIR_IN = 0,
	DIR_OUT,
};

/*
 * struct gpio_pin_status - structure describing a GPIO status
 * @dir:       Configures direction of gpio as "in" or "out", 0=in, 1=out
 * @value:     Configures status of the gpio as 0(low) or 1(high)
 */
struct gpio_mockup_line_status {
	int dir;
	bool value;
};

struct gpio_mockup_irq_context {
	struct irq_work work;
	int irq;
};

struct gpio_mockup_chip {
	struct gpio_chip gc;
	struct gpio_mockup_line_status *lines;
	struct gpio_mockup_irq_context irq_ctx;
	struct dentry *dbg_dir;
};

struct gpio_mockup_dbgfs_private {
	struct gpio_mockup_chip *chip;
	struct gpio_desc *desc;
	int offset;
};

static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_GC << 1];
static int gpio_mockup_params_nr;
module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);

static bool gpio_mockup_named_lines;
module_param_named(gpio_mockup_named_lines,
		   gpio_mockup_named_lines, bool, 0400);

static const char gpio_mockup_name_start = 'A';
static struct dentry *gpio_mockup_dbg_dir;

static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	return chip->lines[offset].value;
}

static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
			    int value)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	chip->lines[offset].value = !!value;
}

static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
			      int value)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	gpio_mockup_set(gc, offset, value);
	chip->lines[offset].dir = DIR_OUT;

	return 0;
}

static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	chip->lines[offset].dir = DIR_IN;

	return 0;
}

static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	return chip->lines[offset].dir;
}

static int gpio_mockup_name_lines(struct device *dev,
				  struct gpio_mockup_chip *chip)
{
	struct gpio_chip *gc = &chip->gc;
	char **names;
	int i;

	names = devm_kzalloc(dev, sizeof(char *) * gc->ngpio, GFP_KERNEL);
	if (!names)
		return -ENOMEM;

	for (i = 0; i < gc->ngpio; i++) {
		names[i] = devm_kasprintf(dev, GFP_KERNEL,
					  "%s-%d", gc->label, i);
		if (!names[i])
			return -ENOMEM;
	}

	gc->names = (const char *const *)names;

	return 0;
}

static int gpio_mockup_to_irq(struct gpio_chip *chip, unsigned int offset)
{
	return chip->irq_base + offset;
}

/*
 * While we should generally support irqmask and irqunmask, this driver is
 * for testing purposes only so we don't care.
 */
static void gpio_mockup_irqmask(struct irq_data *d) { }
static void gpio_mockup_irqunmask(struct irq_data *d) { }

static struct irq_chip gpio_mockup_irqchip = {
	.name		= GPIO_MOCKUP_NAME,
	.irq_mask	= gpio_mockup_irqmask,
	.irq_unmask	= gpio_mockup_irqunmask,
};

static void gpio_mockup_handle_irq(struct irq_work *work)
{
	struct gpio_mockup_irq_context *irq_ctx;

	irq_ctx = container_of(work, struct gpio_mockup_irq_context, work);
	handle_simple_irq(irq_to_desc(irq_ctx->irq));
}

static int gpio_mockup_irqchip_setup(struct device *dev,
				     struct gpio_mockup_chip *chip)
{
	struct gpio_chip *gc = &chip->gc;
	int irq_base, i;

	irq_base = irq_alloc_descs(-1, 0, gc->ngpio, 0);
	if (irq_base < 0)
		return irq_base;

	gc->irq_base = irq_base;
	gc->irqchip = &gpio_mockup_irqchip;

	for (i = 0; i < gc->ngpio; i++) {
		irq_set_chip(irq_base + i, gc->irqchip);
		irq_set_handler(irq_base + i, &handle_simple_irq);
		irq_modify_status(irq_base + i,
				  IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
	}

	init_irq_work(&chip->irq_ctx.work, gpio_mockup_handle_irq);

	return 0;
}

static ssize_t gpio_mockup_event_write(struct file *file,
				       const char __user *usr_buf,
				       size_t size, loff_t *ppos)
{
	struct gpio_mockup_dbgfs_private *priv;
	struct gpio_mockup_chip *chip;
	struct seq_file *sfile;
	struct gpio_desc *desc;
	struct gpio_chip *gc;
	int status, val;
	char buf;

	sfile = file->private_data;
	priv = sfile->private;
	desc = priv->desc;
	chip = priv->chip;
	gc = &chip->gc;

	status = copy_from_user(&buf, usr_buf, 1);
	if (status)
		return status;

	if (buf == '0')
		val = 0;
	else if (buf == '1')
		val = 1;
	else
		return -EINVAL;

	gpiod_set_value_cansleep(desc, val);
	priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
	irq_work_queue(&priv->chip->irq_ctx.work);

	return size;
}

static int gpio_mockup_event_open(struct inode *inode, struct file *file)
{
	return single_open(file, NULL, inode->i_private);
}

static const struct file_operations gpio_mockup_event_ops = {
	.owner = THIS_MODULE,
	.open = gpio_mockup_event_open,
	.write = gpio_mockup_event_write,
	.llseek = no_llseek,
};

static void gpio_mockup_debugfs_setup(struct device *dev,
				      struct gpio_mockup_chip *chip)
{
	struct gpio_mockup_dbgfs_private *priv;
	struct dentry *evfile;
	struct gpio_chip *gc;
	char *name;
	int i;

	gc = &chip->gc;

	chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir);
	if (!chip->dbg_dir)
		goto err;

	for (i = 0; i < gc->ngpio; i++) {
		name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
		if (!name)
			goto err;

		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
		if (!priv)
			goto err;

		priv->chip = chip;
		priv->offset = i;
		priv->desc = &gc->gpiodev->descs[i];

		evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
					     &gpio_mockup_event_ops);
		if (!evfile)
			goto err;
	}

	return;

err:
	dev_err(dev, "error creating debugfs directory\n");
}

static int gpio_mockup_add(struct device *dev,
			   struct gpio_mockup_chip *chip,
			   const char *name, int base, int ngpio)
{
	struct gpio_chip *gc = &chip->gc;
	int ret;

	gc->base = base;
	gc->ngpio = ngpio;
	gc->label = name;
	gc->owner = THIS_MODULE;
	gc->parent = dev;
	gc->get = gpio_mockup_get;
	gc->set = gpio_mockup_set;
	gc->direction_output = gpio_mockup_dirout;
	gc->direction_input = gpio_mockup_dirin;
	gc->get_direction = gpio_mockup_get_direction;
	gc->to_irq = gpio_mockup_to_irq;

	chip->lines = devm_kzalloc(dev, sizeof(*chip->lines) * gc->ngpio,
				   GFP_KERNEL);
	if (!chip->lines)
		return -ENOMEM;

	if (gpio_mockup_named_lines) {
		ret = gpio_mockup_name_lines(dev, chip);
		if (ret)
			return ret;
	}

	ret = gpio_mockup_irqchip_setup(dev, chip);
	if (ret)
		return ret;

	ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
	if (ret)
		return ret;

	if (gpio_mockup_dbg_dir)
		gpio_mockup_debugfs_setup(dev, chip);

	return 0;
}

static int gpio_mockup_probe(struct platform_device *pdev)
{
	struct gpio_mockup_chip *chips;
	struct device *dev = &pdev->dev;
	int ret, i, base, ngpio;
	char *chip_name;

	if (gpio_mockup_params_nr < 2)
		return -EINVAL;

	chips = devm_kzalloc(dev,
			     sizeof(*chips) * (gpio_mockup_params_nr >> 1),
			     GFP_KERNEL);
	if (!chips)
		return -ENOMEM;

	platform_set_drvdata(pdev, chips);

	for (i = 0; i < gpio_mockup_params_nr >> 1; i++) {
		base = gpio_mockup_ranges[i * 2];

		if (base == -1)
			ngpio = gpio_mockup_ranges[i * 2 + 1];
		else
			ngpio = gpio_mockup_ranges[i * 2 + 1] - base;

		if (ngpio >= 0) {
			chip_name = devm_kasprintf(dev, GFP_KERNEL,
						   "%s-%c", GPIO_MOCKUP_NAME,
						   gpio_mockup_name_start + i);
			if (!chip_name)
				return -ENOMEM;

			ret = gpio_mockup_add(dev, &chips[i],
					      chip_name, base, ngpio);
		} else {
			ret = -1;
		}

		if (ret) {
			dev_err(dev, "gpio<%d..%d> add failed\n",
				base, base < 0 ? ngpio : base + ngpio);

			return ret;
		}

		dev_info(dev, "gpio<%d..%d> add successful!",
			 base, base + ngpio);
	}

	return 0;
}

static int gpio_mockup_remove(struct platform_device *pdev)
{
	struct gpio_mockup_chip *chips;
	int i;

	chips = platform_get_drvdata(pdev);

	for (i = 0; i < gpio_mockup_params_nr >> 1; i++)
		irq_free_descs(chips[i].gc.irq_base, chips[i].gc.ngpio);

	return 0;
}

static struct platform_driver gpio_mockup_driver = {
	.driver = {
		.name = GPIO_MOCKUP_NAME,
	},
	.probe = gpio_mockup_probe,
	.remove = gpio_mockup_remove,
};

static struct platform_device *pdev;
static int __init mock_device_init(void)
{
	int err;

	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
	if (!gpio_mockup_dbg_dir)
		pr_err("%s: error creating debugfs directory\n",
		       GPIO_MOCKUP_NAME);

	pdev = platform_device_alloc(GPIO_MOCKUP_NAME, -1);
	if (!pdev)
		return -ENOMEM;

	err = platform_device_add(pdev);
	if (err) {
		platform_device_put(pdev);
		return err;
	}

	err = platform_driver_register(&gpio_mockup_driver);
	if (err) {
		platform_device_unregister(pdev);
		return err;
	}

	return 0;
}

static void __exit mock_device_exit(void)
{
	debugfs_remove_recursive(gpio_mockup_dbg_dir);
	platform_driver_unregister(&gpio_mockup_driver);
	platform_device_unregister(pdev);
}

module_init(mock_device_init);
module_exit(mock_device_exit);

MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
MODULE_DESCRIPTION("GPIO Testing driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
0f98dd1b BJZ	1	/*
	2	* GPIO Testing Device Driver
	3	*
	4	* Copyright (C) 2014 Kamlakant Patel <kamlakant.patel@broadcom.com>
	5	* Copyright (C) 2015-2016 Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*
	12	*/
	13
	14	#include <linux/init.h>
	15	#include <linux/module.h>
	16	#include <linux/gpio/driver.h>
9202ba23	17	#include <linux/gpio/consumer.h>
0f98dd1b	18	#include <linux/platform_device.h>
8a68ea00	19	#include <linux/slab.h>
e2ff7408 BG	20	#include <linux/interrupt.h>
	21	#include <linux/irq.h>
	22	#include <linux/irq_work.h>
9202ba23 BG	23	#include <linux/debugfs.h>
	24	#include <linux/uaccess.h>
	25
	26	#include "gpiolib.h"
0f98dd1b	27
ca409160 BG	28	#define GPIO_MOCKUP_NAME "gpio-mockup"
ca409160 BG	29	#define GPIO_MOCKUP_MAX_GC 10
0f98dd1b	30
ca409160 BG	31	enum {
	32	DIR_IN = 0,
	33	DIR_OUT,
0f98dd1b BJZ	34	};
	35
	36	/*
	37	* struct gpio_pin_status - structure describing a GPIO status
	38	* @dir: Configures direction of gpio as "in" or "out", 0=in, 1=out
	39	* @value: Configures status of the gpio as 0(low) or 1(high)
	40	*/
ca409160 BG	41	struct gpio_mockup_line_status {
ca409160 BG	42	int dir;
0f98dd1b BJZ	43	bool value;
	44	};
	45
e2ff7408 BG	46	struct gpio_mockup_irq_context {
	47	struct irq_work work;
	48	int irq;
	49	};
	50
ca409160	51	struct gpio_mockup_chip {
0f98dd1b	52	struct gpio_chip gc;
ca409160	53	struct gpio_mockup_line_status *lines;
e2ff7408	54	struct gpio_mockup_irq_context irq_ctx;
9202ba23 BG	55	struct dentry *dbg_dir;
	56	};
	57
	58	struct gpio_mockup_dbgfs_private {
	59	struct gpio_mockup_chip *chip;
	60	struct gpio_desc *desc;
	61	int offset;
0f98dd1b BJZ	62	};
0f98dd1b BJZ	63
ca409160	64	static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_GC << 1];
0f98dd1b BJZ	65	static int gpio_mockup_params_nr;
	66	module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
	67
8a68ea00 BG	68	static bool gpio_mockup_named_lines;
	69	module_param_named(gpio_mockup_named_lines,
	70	gpio_mockup_named_lines, bool, 0400);
	71
ca409160	72	static const char gpio_mockup_name_start = 'A';
9202ba23	73	static struct dentry *gpio_mockup_dbg_dir;
0f98dd1b	74
ca409160	75	static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	76	{
ca409160	77	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	78
ca409160	79	return chip->lines[offset].value;
0f98dd1b BJZ	80	}
0f98dd1b BJZ	81
ca409160	82	static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	83	int value)
0f98dd1b BJZ	84	{
ca409160	85	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	86
ca409160	87	chip->lines[offset].value = !!value;
0f98dd1b BJZ	88	}
0f98dd1b BJZ	89
ca409160	90	static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	91	int value)
0f98dd1b BJZ	92	{
ca409160 BG	93	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	94
	95	gpio_mockup_set(gc, offset, value);
	96	chip->lines[offset].dir = DIR_OUT;
0f98dd1b	97
0f98dd1b BJZ	98	return 0;
	99	}
	100
ca409160	101	static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	102	{
ca409160 BG	103	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	104
	105	chip->lines[offset].dir = DIR_IN;
0f98dd1b	106
0f98dd1b BJZ	107	return 0;
	108	}
	109
ca409160	110	static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	111	{
ca409160	112	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	113
ca409160	114	return chip->lines[offset].dir;
0f98dd1b BJZ	115	}
0f98dd1b BJZ	116
8a68ea00 BG	117	static int gpio_mockup_name_lines(struct device *dev,
	118	struct gpio_mockup_chip *chip)
	119	{
	120	struct gpio_chip *gc = &chip->gc;
	121	char **names;
	122	int i;
	123
	124	names = devm_kzalloc(dev, sizeof(char ) gc->ngpio, GFP_KERNEL);
	125	if (!names)
	126	return -ENOMEM;
	127
	128	for (i = 0; i < gc->ngpio; i++) {
	129	names[i] = devm_kasprintf(dev, GFP_KERNEL,
	130	"%s-%d", gc->label, i);
	131	if (!names[i])
	132	return -ENOMEM;
	133	}
	134
	135	gc->names = (const char const )names;
	136
	137	return 0;
	138	}
	139
e2ff7408 BG	140	static int gpio_mockup_to_irq(struct gpio_chip *chip, unsigned int offset)
	141	{
	142	return chip->irq_base + offset;
	143	}
	144
	145	/*
	146	* While we should generally support irqmask and irqunmask, this driver is
	147	* for testing purposes only so we don't care.
	148	*/
	149	static void gpio_mockup_irqmask(struct irq_data *d) { }
	150	static void gpio_mockup_irqunmask(struct irq_data *d) { }
	151
	152	static struct irq_chip gpio_mockup_irqchip = {
	153	.name = GPIO_MOCKUP_NAME,
	154	.irq_mask = gpio_mockup_irqmask,
	155	.irq_unmask = gpio_mockup_irqunmask,
	156	};
	157
	158	static void gpio_mockup_handle_irq(struct irq_work *work)
	159	{
	160	struct gpio_mockup_irq_context *irq_ctx;
	161
	162	irq_ctx = container_of(work, struct gpio_mockup_irq_context, work);
	163	handle_simple_irq(irq_to_desc(irq_ctx->irq));
	164	}
	165
	166	static int gpio_mockup_irqchip_setup(struct device *dev,
	167	struct gpio_mockup_chip *chip)
	168	{
	169	struct gpio_chip *gc = &chip->gc;
	170	int irq_base, i;
	171
	172	irq_base = irq_alloc_descs(-1, 0, gc->ngpio, 0);
	173	if (irq_base < 0)
	174	return irq_base;
	175
	176	gc->irq_base = irq_base;
	177	gc->irqchip = &gpio_mockup_irqchip;
	178
	179	for (i = 0; i < gc->ngpio; i++) {
	180	irq_set_chip(irq_base + i, gc->irqchip);
	181	irq_set_handler(irq_base + i, &handle_simple_irq);
	182	irq_modify_status(irq_base + i,
	183	IRQ_NOREQUEST \| IRQ_NOAUTOEN, IRQ_NOPROBE);
	184	}
	185
	186	init_irq_work(&chip->irq_ctx.work, gpio_mockup_handle_irq);
	187
	188	return 0;
	189	}
	190
9202ba23 BG	191	static ssize_t gpio_mockup_event_write(struct file *file,
	192	const char __user *usr_buf,
	193	size_t size, loff_t *ppos)
	194	{
	195	struct gpio_mockup_dbgfs_private *priv;
	196	struct gpio_mockup_chip *chip;
	197	struct seq_file *sfile;
	198	struct gpio_desc *desc;
	199	struct gpio_chip *gc;
	200	int status, val;
	201	char buf;
	202
	203	sfile = file->private_data;
	204	priv = sfile->private;
	205	desc = priv->desc;
	206	chip = priv->chip;
	207	gc = &chip->gc;
	208
	209	status = copy_from_user(&buf, usr_buf, 1);
	210	if (status)
	211	return status;
	212
	213	if (buf == '0')
	214	val = 0;
	215	else if (buf == '1')
	216	val = 1;
	217	else
	218	return -EINVAL;
	219
	220	gpiod_set_value_cansleep(desc, val);
	221	priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
	222	irq_work_queue(&priv->chip->irq_ctx.work);
	223
	224	return size;
	225	}
	226
	227	static int gpio_mockup_event_open(struct inode inode, struct file file)
	228	{
	229	return single_open(file, NULL, inode->i_private);
	230	}
	231
	232	static const struct file_operations gpio_mockup_event_ops = {
	233	.owner = THIS_MODULE,
	234	.open = gpio_mockup_event_open,
	235	.write = gpio_mockup_event_write,
	236	.llseek = no_llseek,
	237	};
	238
	239	static void gpio_mockup_debugfs_setup(struct device *dev,
	240	struct gpio_mockup_chip *chip)
	241	{
	242	struct gpio_mockup_dbgfs_private *priv;
	243	struct dentry *evfile;
	244	struct gpio_chip *gc;
	245	char *name;
	246	int i;
	247
	248	gc = &chip->gc;
	249
	250	chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir);
	251	if (!chip->dbg_dir)
	252	goto err;
	253
	254	for (i = 0; i < gc->ngpio; i++) {
255	name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
256	if (!name)
257	goto err;
258
259	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
260	if (!priv)
261	goto err;
262
263	priv->chip = chip;
264	priv->offset = i;
265	priv->desc = &gc->gpiodev->descs[i];
266
267	evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
268	&gpio_mockup_event_ops);
269	if (!evfile)
270	goto err;
271	}
272
273	return;
274
275	err:
276	dev_err(dev, "error creating debugfs directory\n");
277	}
278
ca409160 BG	279	static int gpio_mockup_add(struct device *dev,
ca409160 BG	280	struct gpio_mockup_chip *chip,
0f98dd1b BJZ	281	const char *name, int base, int ngpio)
0f98dd1b BJZ	282	{
ca409160	283	struct gpio_chip *gc = &chip->gc;
8a68ea00	284	int ret;
0f98dd1b	285
ca409160 BG	286	gc->base = base;
	287	gc->ngpio = ngpio;
	288	gc->label = name;
	289	gc->owner = THIS_MODULE;
	290	gc->parent = dev;
	291	gc->get = gpio_mockup_get;
	292	gc->set = gpio_mockup_set;
	293	gc->direction_output = gpio_mockup_dirout;
	294	gc->direction_input = gpio_mockup_dirin;
	295	gc->get_direction = gpio_mockup_get_direction;
e2ff7408	296	gc->to_irq = gpio_mockup_to_irq;
ca409160 BG	297
ca409160 BG	298	chip->lines = devm_kzalloc(dev, sizeof(chip->lines) gc->ngpio,
0f98dd1b	299	GFP_KERNEL);
e4ba07bf BG	300	if (!chip->lines)
e4ba07bf BG	301	return -ENOMEM;
ca409160	302
8a68ea00 BG	303	if (gpio_mockup_named_lines) {
	304	ret = gpio_mockup_name_lines(dev, chip);
	305	if (ret)
	306	return ret;
	307	}
	308
e2ff7408 BG	309	ret = gpio_mockup_irqchip_setup(dev, chip);
	310	if (ret)
	311	return ret;
	312
9202ba23 BG	313	ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
	314	if (ret)
	315	return ret;
	316
	317	if (gpio_mockup_dbg_dir)
	318	gpio_mockup_debugfs_setup(dev, chip);
	319
	320	return 0;
0f98dd1b BJZ	321	}
0f98dd1b BJZ	322
ca409160	323	static int gpio_mockup_probe(struct platform_device *pdev)
0f98dd1b	324	{
ca409160	325	struct gpio_mockup_chip *chips;
364ac456 BG	326	struct device *dev = &pdev->dev;
364ac456 BG	327	int ret, i, base, ngpio;
ad6d8004	328	char *chip_name;
0f98dd1b BJZ	329
	330	if (gpio_mockup_params_nr < 2)
	331	return -EINVAL;
	332
ca409160 BG	333	chips = devm_kzalloc(dev,
	334	sizeof(chips) (gpio_mockup_params_nr >> 1),
	335	GFP_KERNEL);
	336	if (!chips)
0f98dd1b BJZ	337	return -ENOMEM;
0f98dd1b BJZ	338
ca409160	339	platform_set_drvdata(pdev, chips);
0f98dd1b BJZ	340
	341	for (i = 0; i < gpio_mockup_params_nr >> 1; i++) {
	342	base = gpio_mockup_ranges[i * 2];
ca409160	343
0f98dd1b BJZ	344	if (base == -1)
	345	ngpio = gpio_mockup_ranges[i * 2 + 1];
	346	else
	347	ngpio = gpio_mockup_ranges[i * 2 + 1] - base;
	348
	349	if (ngpio >= 0) {
ad6d8004	350	chip_name = devm_kasprintf(dev, GFP_KERNEL,
ca409160 BG	351	"%s-%c", GPIO_MOCKUP_NAME,
ca409160 BG	352	gpio_mockup_name_start + i);
ad6d8004 BG	353	if (!chip_name)
	354	return -ENOMEM;
	355
ca409160	356	ret = gpio_mockup_add(dev, &chips[i],
0f98dd1b BJZ	357	chip_name, base, ngpio);
	358	} else {
	359	ret = -1;
	360	}
ca409160	361
0f98dd1b	362	if (ret) {
e4ba07bf BG	363	dev_err(dev, "gpio<%d..%d> add failed\n",
e4ba07bf BG	364	base, base < 0 ? ngpio : base + ngpio);
0f98dd1b BJZ	365
	366	return ret;
	367	}
e4ba07bf BG	368
	369	dev_info(dev, "gpio<%d..%d> add successful!",
	370	base, base + ngpio);
0f98dd1b BJZ	371	}
	372
	373	return 0;
	374	}
	375
e2ff7408 BG	376	static int gpio_mockup_remove(struct platform_device *pdev)
	377	{
	378	struct gpio_mockup_chip *chips;
	379	int i;
	380
	381	chips = platform_get_drvdata(pdev);
	382
	383	for (i = 0; i < gpio_mockup_params_nr >> 1; i++)
	384	irq_free_descs(chips[i].gc.irq_base, chips[i].gc.ngpio);
	385
	386	return 0;
	387	}
	388
ca409160	389	static struct platform_driver gpio_mockup_driver = {
0f98dd1b	390	.driver = {
ca409160	391	.name = GPIO_MOCKUP_NAME,
364ac456	392	},
ca409160	393	.probe = gpio_mockup_probe,
e2ff7408	394	.remove = gpio_mockup_remove,
0f98dd1b BJZ	395	};
	396
	397	static struct platform_device *pdev;
	398	static int __init mock_device_init(void)
	399	{
	400	int err;
	401
9202ba23 BG	402	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
	403	if (!gpio_mockup_dbg_dir)
	404	pr_err("%s: error creating debugfs directory\n",
	405	GPIO_MOCKUP_NAME);
	406
ca409160	407	pdev = platform_device_alloc(GPIO_MOCKUP_NAME, -1);
0f98dd1b BJZ	408	if (!pdev)
	409	return -ENOMEM;
	410
	411	err = platform_device_add(pdev);
	412	if (err) {
	413	platform_device_put(pdev);
	414	return err;
	415	}
	416
ca409160	417	err = platform_driver_register(&gpio_mockup_driver);
0f98dd1b BJZ	418	if (err) {
	419	platform_device_unregister(pdev);
	420	return err;
	421	}
	422
	423	return 0;
	424	}
	425
	426	static void __exit mock_device_exit(void)
	427	{
9202ba23	428	debugfs_remove_recursive(gpio_mockup_dbg_dir);
ca409160	429	platform_driver_unregister(&gpio_mockup_driver);
0f98dd1b BJZ	430	platform_device_unregister(pdev);
	431	}
	432
	433	module_init(mock_device_init);
	434	module_exit(mock_device_exit);
	435
	436	MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
	437	MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
	438	MODULE_DESCRIPTION("GPIO Testing driver");
	439	MODULE_LICENSE("GPL v2");